Crypt-Gorger Ooze

When Crypt-Gorger Ooze enters the battlefield, you may exile any number of creatures from all graveyards. Put a +1/+1 counter on Crypt-Gorger Ooze for each card exiled this way.
{x}{b}{g}, remove X +1/+1 counters from
Crypt-Gorger Ooze: Put an X/X green Ooze creature token onto the battlefield.